This is not a system font, but a handwritten calligraphy font, which is collected and uploaded by the website, and may be the handwriting of a great calligrapher of a certain dynasty. You Baidu search: online calligraphy font generation, there will be many websites to provide calligraphy font search.
Let's take a look at the source files of two fonts of mahogany that we just found for you. If you need other similar fonts, you can enter text points in the search box in Figure 2 below to generate them immediately, and the system will search out a set of calligraphy fonts for you to choose from.